100 Matching Results

Search Results

Results: 1 - 24 next
open access

ELECTROLYTIC DISSOLUTION OF NUCLEAR FUELS. PART I. ZIRCONIUM IN HCl- METHANOL

Description: The electrolytic dissolution of zirconium in HCl-methanol was studied as a function of potential, solution composition, and temperature. The dissolution is characterized by two regions. At high potentials the zirconium is electropolished and complete dissolution is achieved. At low potentials the current is an exponential function of the potential (Tafel behavior). In this region a small amount of finely divided alpha -zirconium which is insoluble in HCl-methanol separates from the bulk metal. … more
Date: December 29, 1961
Creator: Aylward, J. R.; Whitener, E. M. & Hahn, H. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Nuclear materials research progress reports for 1979

Description: Research is presented concerning iodide stress corrosion cracking of zircaloy, self-diffusion of oxygen in hypostoichiometric urania, surface chemistry of epitaxial silicon deposition by thermal cracking of silane, kinetics of laser pulse vaporization of UO/sub 2/, gas laser model for laser induced evaporation, solubility of hydrogen in uranium dioxide, thermal gradient migration of metallic inclusions in UO/sub 2/, molecular beam studies of atomic hydrogen reduction of oxides, and thermal grad… more
Date: December 1, 1979
Creator: Olander, D.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Studies of Coupled Chemical and Catalytic Coal Conversion Methods

Description: The objective of this research was to convert coal into a soluble substance under mild conditions. The strategy involved two steps, first to breakdown the macromolecular network of coal, and second to add hydrogen catalytically. We investigated different basic reagents that could, in priciple, break down coal's structure and alkylation strategies that might enhance its solubility. We examined O- and C-alkylation, the importance of the strength of the base, the character of the added alkyl group… more
Date: December 1, 1991
Creator: Stock, L. M.; Chatterjee, K.; Cheng, C.; Ettinger, M.; Flores, F.; Jiralerspong, S. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Lanthanide extraction with 2,5-dimethyl-2-hydroxyhexanoic acid

Description: This research is concerned with the solvent extraction into chloroform of the lanthanides, using 2,5-dimethyl-2-hydroxyhexanoic acid (DMHHA). This acid is the first ..cap alpha..-hydroxy aliphatic acid to be studied as an extracting agent for the lanthanides. The chloroform-water DMHHA partition constant was determined to be 1.0 (at 0.1 M ionic strength and 25/sup 0/C). The acid dimerizes in chloroform with a constant of 56. The light lanthanides can be extracted into chloroform by forming comp… more
Date: December 1, 1977
Creator: Miller, J. H.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

Gas and aerosol scavenging

Description: The wet removal rate and wet deposition of pollutants is ultimately dependent upon the rate of pollutant attachment to the falling precipitation particles (hydrometeors) and to the precipitation flux at the ground. This attachment to the hydrometeors or collector particles is, in turn, dependent upon the physical characteristics of the pollutant. As expected, when considering wet removal, gases behave differently from aerosols. Modelers of gas scavenging (e.g., Hales 1972, Adamowitz 1979) stres… more
Date: December 1, 1979
Creator: Scott, B.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Investigation and evaluation of geopressured-geothermal wells. Fairfax Foster Sutter No. 2 well, St. Mary Parish, Louisiana. Volume I. Completion and testing. Final report

Description: The Fairfax Foster Sutter No. 2 well, located in the East Franklin area of St. Mary Parish, Louisiana, is the first successful test of a geopressured-geothermal aquifer under the Well-of-Opportunity program. The section tested was the MA-6 sand of lower Miocene age which has produced large quantities of gas from the adjacent but structurally separated Garden City field. In the subject well the observed temperature was 270{sup 0}F (132{sup 0}C) and the measured gradient was 0.77 psi/ft. The gros… more
Date: December 1, 1979
Creator: Willits, M. H.; McCoy, R. L.; Dobson, R. J. & Hartsock, J. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The mobile phase in coals: Its nature and modes of release: Final report: Part 1, Structural inferences from dry catalytic hydrogenation of a subbituminous coal

Description: In a study to provide insight into the two component structural model of coal and the mechanisms of coal liquefaction, an approach was adopted in which a subbituminous coal was reacted with hydrogen in the presence of an impregnated molybdenum sulphide catalyst and in the absence of solvent. Reactions were conducted at temperatures between 300 and 400/sup 0/C and for reaction times up to 180 min. The composition and yields of gaseous products, chloroform-soluble liquids and insoluble residues w… more
Date: December 1, 1986
Creator: Terrer, M. T. & Derbyshire, F. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Analytical Chemistry Laboratory Progress Report for FY 1991

Description: The purpose of this report is to summarize the activities of the Analytical Chemistry Laboratory (ACL) at Argonne National Laboratory (ANL) for Fiscal Year 1991 (October 1990 through September 1991). This is the eighth annual report for the ACL. The Analytical Chemistry Laboratory is a full-cost-recovery service center, with the primary mission of providing a broad range of analytical chemistry support services to the scientific and engineering programs at ANL. In addition, the ACL conducts a r… more
Date: December 1, 1991
Creator: Green, D. W.; Heinrich, R. R.; Graczyk, D. G.; Lindahl, P. C. & Boparai, A. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Nuclear materials research progress reports for 1977

Description: Research is reported concerning radiation enhancement of stress corrosion cracking of Zircaloy, surface chemistry of epitaxial Si deposited by thermal cracking of silane, thermal gradient migration of metallic inclusions in UO/sub 2/, molecular beam studies of atomic H and reduction of oxides, mass transfer and reduction of UO/sub 2/, kinetics of laser pulse vaporization of UO/sub 2/, retention and release of water by UO/sub 2/ pellets, and solubility of H in UO/sub 2/. (FS)
Date: December 1, 1977
Creator: Olander, D.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Low Temperature Surface Carburization of Stainless Steels

Description: Low-temperature colossal supersaturation (LTCSS) is a novel surface hardening method for carburization of austenitic stainless steels (SS) without the precipitation of carbides. The formation of carbides is kinetically suppressed, enabling extremely high or colossal carbon supersaturation. As a result, surface carbon concentrations in excess of 12 at. % are routinely achieved. This treatment increases the surface hardness by a factor of four to five, improving resistance to wear, corrosion, and… more
Date: December 7, 2007
Creator: Collins, Sunniva R.; Heuer, Arthur H. & Sikka, Vinod K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

TRANSMISSION ELECTRON MICROSCOPY STUDY OF HELIUM BEARING FUSION WELDS

Description: A transmission electron microscopy (TEM) study was conducted to characterize the helium bubble distributions in tritium-charged-and-aged 304L and 21Cr-6Ni-9Mn stainless steel fusion welds containing approximately 150 appm helium-3. TEM foils were prepared from C-shaped fracture toughness test specimens containing {delta} ferrite levels ranging from 4 to 33 volume percent. The weld microstructures in the low ferrite welds consisted mostly of austenite and discontinuous, skeletal {delta} ferrite.… more
Date: December 12, 2008
Creator: Tosten, M & Michael Morgan, M
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Recovery of uranium-233 from a thorium breeding blanket by pyrochemical techniques

Description: We have carefully evaluated several processes that might be suitable for uranium recovery from thorium metal, and have chosen two that hold great promise. Both are simple non-aqueous methods that can readily be performed by remote means, and both require only a few simple process steps.
Date: December 8, 1982
Creator: Coops, M.S. & Knighton, J.B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Chloride anion exchange coprocessing for recovery of plutonium from pyrochemical residues and Cs sub 2 PuCl sub 6 filtrate

Description: Continuing studies of plutonium recovery from direct oxide reduction (DOR) and electrorefining (ER) pyrochemical process residues show that chloride anion exchange coprocessing is useful and effective. Coprocessing utilizes DOR residue salt as a reagent to supply the bulk of chloride ion needed for the chloride anion exchange process and to improve ER residue salt solubility. ER residue salt and ER scrapeout can be successfully treated, either alone or together, using coprocessing. In addition,… more
Date: December 7, 1990
Creator: Muscatello, A. C. & Killion, M. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of the potential end use of oils produced by the ROPE copyright process from California tar sand

Description: The oil products produced by the rope process from Process Development Unit (PDU) run SPR-111 were evaluated for potential end use. This run was a five-day test using Arroyo Grande tar sand from California as the feed to the PDU. The distillate from knockout {number sign}2 was hydrotreated to produce a series of process intermediates. One of the intermediates was evaluated as a feedstock for the production of transportation fuels. The heavy product oil was distilled to produce a residue that wa… more
Date: December 1, 1989
Creator: Thomas, K. P. & Harnsberger, P. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Measurement of H/sub 2/, D/sub 2/ solubilities in Zr-Al

Description: We have measured solubility constants for hydrogen and deuterium in the Zr-Al alloy to be: K/sub H/ = exp (11.1(5) - 16900(600)/T9 (Torr/(Torr-1/g)/sup 2/) and K/sub D/ = exp (12.2(8) - 16800(600)/T) (Torr/Torr-1/g)/sup 2/) respectively, where K is defined implicitly by P = Kq/sup 2/ with P the equilibrium pressre (in Torr) and q the bulk concentration (in Torr-l/g). These values, in conjunction with a model for the solubility, predict that the constant for tritium, K/sub T/ approx. 4 K/sub H/.… more
Date: December 1, 1981
Creator: Knize, R. J.; Cecchi, J. L. & Dylla, H. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Proceedings of the workshop on radioactivity associated with coal use

Description: A workshop on radioactivity in coal use was held on September 15 through 17, 1981, under the auspices of the US Department of Energy, Office of Environmental Programs, and the Los Alamos National Laboratory. The purpose of the workshop was to identify research issues associated with radioactivity resulting from the use of coal for electric power generation. The concensus of the 10 scientists participating in the workshop was that a moderate to strong need exists for research in solubility of fl… more
Date: December 1, 1981
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Hydrocarbon solubility and its migration processes: a look at the present status

Description: In this study we review the present status of knowledge of solubility of hydrocarbons and its implications on primary migration processes. The intent is to examine the solubility and the transportation mechanisms relevant to geopressured-geothermal reservoirs, although the discussion included here accommodates a wide range of related aspects. Influences of parameters associated with hydrocarbon (especially methane) solubility have been studied. We have sought to evaluate several primary hydroca… more
Date: December 1, 1985
Creator: Mamun, C.K.; Ohkuma, H. & Sepehrnoori, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Some effects of data base variations on numerical simulations of uranium migration

Description: Numerical simulations of migration of chemicals in the geosphere depend on knowledge of identities of chemical species and on values of chemical equilibrium constants supplied to the simulators. In this work, some effects of variability in assumed speciation and in equilibrium constants were examined, using migration of uranium as an example. Various simulations were done of uranium migration in systems with varying oxidation potential, pH, and mator component content. A simulation including fo… more
Date: December 1, 1987
Creator: Carnahan, C.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Solubilization of trace organics in block copolymer micelles for environmental separation using membrane extraction principles

Description: The solubilization of a range of polycyclic aromatic hydrocarbons in block copolymer micelles has been studied as a function of polymer composition, architecture, and temperature. Micelle formation is favored at high temperatures, leading to significant enhancements in solubilization capacity. At low temperatures, however, micelles do not form and the solubilization capacity of the block copolymer solution for the organics is low; this provides a convenient method for the regeneration of micell… more
Date: December 1, 1992
Creator: Hatton, T. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Solubility of AmOHCO sub 3 in aqueous solution under atmospheric conditions

Description: Modeling calculations on the solubility of americium have indicated that basic americium carbonate, and not americium trihydroxide, is the solubility-controlling solid in the pH range from 6 to 10 under the influence of atmospheric CO{sub 2}. The solubility of crystalline {sup 243}AmOHCO{sup 3} has been investigated in batch experiments in near-neutral and basic solutions as a function of dissolution time in 0.1 M NaClO{sup 4} at room temperature under oxic conditions. After the solutions reach… more
Date: December 1, 1987
Creator: Nitsche, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen